A "blood moon" eclipse will be occurring early Wednesday morning.

The total eclipse will begin at about 6:25 a.m., says the National Oceanic and Atmospheric Administration.The eclipse begins with the partial phase, when the moon enters Earth's dark shadow.That begins at 5:15 a.m. Then the umbral shadow will spread across the moon's disk, moving from left to right.At 6:25 a.m., totality begins when the moon is fully engulfed in the umbral shadow and turns a shade of orange red. The deepest or midpoint of the eclipse will be at 6:55 a.m.Lunar eclipses are safe to watch with the naked eye, unlike solar eclipses.Why Is a Blood Moon Red?During the total phase of the eclipse, sunlight shining through the ring of Earth's dusty atmosphere is bent, or refracted. The red part of the light is cast onto the moon's surface.Viewers see the lunar disk go from dark gray during the partial phase of the eclipse to reddish orange during totality.The National Aeronautics and Space Administration said four eclipses are occurring this year, a rarity.The final will be a partial solar eclipse on Oct. 23.A lunar eclipse had occurred on April 15 and a solar eclipse happened on April 29.